Cut out a heart on some paper and use it as
a template to trace onto the wood.

Cut it out.

Sand the edges.

Give it a few coats of mineral oil. Let the oil
soak in after each coat. It will condition the
wood, darkening it a bit and bring out the
grain. Re-apply anytime your boards need it.
I keep the oil-soaked cloth in an empty tennis
can to use anytime I want to re-condition my
cutting boards or butcher block island top.